On 6/19/19 1:18 AM, Vlastimil Babka wrote:
On 6/18/19 7:06 PM, Yang Shi wrote:The BUG_ON was removed by commit d44d363f65780f2ac2ec672164555af54896d40d ("mm: don't assume anonymous pages have SwapBacked flag") since 4.12.Perhaps that commit should be sent to stable@ ? Although with VM_BUG_ON() this is less critical than plain BUG_ON().
I don't think we have to. I agree it is less critical, VM_DEBUG should be not enabled for production environment.
And, it doesn't actually break anything since split_huge_page would just return error, and those unmovable pages are silently ignored by isolate.
